64121650 has 24 divisors (see below), whose sum is σ = 120711024. Its totient is φ = 25338000.

The previous prime is 64121647. The next prime is 64121653. The reversal of 64121650 is 5612146.

It is an interprime number because it is at equal distance from previous prime (64121647) and next prime (64121653).

It is a super-2 number, since 2×64121650² = 8223171997445000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (64121653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3576 + ... + 11875.

It is an arithmetic number, because the mean of its divisors is an integer number (5029626).

Almost surely, 2^64121650 is an apocalyptic number.

64121650 is a deficient number, since it is larger than the sum of its proper divisors (56589374).

64121650 is a wasteful number, since it uses less digits than its factorization.

64121650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15546 (or 15541 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 64121650 is about 8007.5995154603. The cubic root of 64121650 is about 400.2532770929.

Adding to 64121650 its reverse (5612146), we get a palindrome (69733796).

The spelling of 64121650 in words is "sixty-four million, one hundred twenty-one thousand, six hundred fifty".